Save up to $300 on ZWO AM5 and AM3 mount packages while supplies last!Save up to $300 on ZWO AM5 and AM3 mount packages while supplies last!

 ECLIPSE ORDERS: New orders will not ship in time. Local pickup orders can be ordered until 1pm PT Sat, Apr 6 and picked up by 2pm. 

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  1. ZWO M48x0.75 Female to T/T2 M42x0.75 Male Adapter Set with 37.5mm Extension
    ZWO M48x0.75 Female to T/T2 M42x0.75 Male Adapter Set with 37.5mm Extension
    Our Price: $37.00
    In Stock
    Free US Shipping
    Added: 23-Jun-22
  2. ZWO M42 (T/T2) to M48 Extender / 2" Prime Focus Adapter with 16.5mm Extension # M42-M48-16.5MM
    ZWO M42 (T/T2) to M48 Extender / 2" Prime Focus Adapter with 16.5mm Extension # M42-M48-16.5MM
    Our Price: $19.00
    In Stock
    Free US Shipping Over $25
    Added: 26-Feb-17
  3. Dew-Not Dew Heater Strip - 30" Length # DN09
    Dew-Not Dew Heater Strip - 30" Length # DN09
    Our Price: $54.00
    In Stock
    Free US Shipping
    Added: 21-May-10
  4. William Optics High Latitude Vixen-style Base Mount & Extension Bar for iOptron Skyguider Pro - Red
    William Optics High Latitude Vixen-style Base Mount & Extension Bar for iOptron Skyguider Pr...
    Our Price: $240.00
    In Stock
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    Added: 17-Sep-19
  5. William Optics Low Latitude Vixen-style Base Mount & Extension Bar for iOptron Skyguider Pro - Red
    William Optics Low Latitude Vixen-style Base Mount & Extension Bar for iOptron Skyguider Pro...
    Our Price: $240.00
    In Stock
    Free US Shipping
    Added: 17-Sep-19
  6. William Optics Extension Bar for iOptron SkyGuider Pro Mount - Red
    William Optics Extension Bar for iOptron SkyGuider Pro Mount - Red
    Our Price: $34.00
    In Stock
    Free US Shipping
    Added: 16-May-19
  7. ZWO ASI178MC 6.4 MP CMOS Color Astronomy Camera with USB 3.0 # ASI178MC
    ZWO ASI178MC 6.4 MP CMOS Color Astronomy Camera with USB 3.0 # ASI178MC
    Our Price: $269.00
    Out of Stock
    Free US Shipping
    Added: 28-Feb-16
  8. Thousand Oaks Optical Solar Eclipse Viewing Glasses - Pack of 50
    Thousand Oaks Optical Solar Eclipse Viewing Glasses - Pack of 50
    Our Price: $69.99
    In Stock
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    Added: 13-Jun-23
  9. Thousand Oaks Optical Solar Eclipse Viewing Glasses - Pack of 100
    Thousand Oaks Optical Solar Eclipse Viewing Glasses - Pack of 100
    Our Price: $124.99
    In Stock
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    Added: 13-Jun-23
  10. Thousand Oaks Optical Solar Eclipse Viewing Glasses - Pack of 5
    Thousand Oaks Optical Solar Eclipse Viewing Glasses - Pack of 5
    Our Price: $13.99
    In Stock
    Free US Shipping Over $25
    Added: 12-Aug-22
  11. Thousand Oaks Optical Solar Eclipse Viewing Glasses - Pack of 10
    Thousand Oaks Optical Solar Eclipse Viewing Glasses - Pack of 10
    Our Price: $21.99
    In Stock
    Free US Shipping Over $25
    Added: 12-Aug-22
  12. Thousand Oaks Optical Solar Eclipse Viewing Glasses - Pack of 25
    Thousand Oaks Optical Solar Eclipse Viewing Glasses - Pack of 25
    Our Price: $36.99
    In Stock
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    Added: 12-Aug-22
  13. William Optics Black Mounting Ring with Red Handle/Saddle Bar for SpaceCat
    William Optics Black Mounting Ring with Red Handle/Saddle Bar for SpaceCat
    Our Price: $87.00
    In Stock
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    Added: 07-Nov-19
  14. William Optics Cat Saddle Handle Bar for Redcat / Spacecat 51 Telescope - Red # M-HCRC-RD
    William Optics Cat Saddle Handle Bar for Redcat / Spacecat 51 Telescope - Red # M-HCRC-RD
    Our Price: $53.00
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    Added: 03-Oct-19
  15. Baader 1.25" 2.25x Hyperion Zoom Barlow with T-Adapter # 2956180
    Baader 1.25" 2.25x Hyperion Zoom Barlow with T-Adapter # 2956180
    Our Price: $151.00
    In Stock
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    Added: 05-Aug-11
  16. Agena End Cap: ID = 0.965" (24.5mm), Plastic, Yellow
    Agena End Cap: ID = 0.965" (24.5mm), Plastic, Yellow
    Our Price: $0.80
    In Stock
    Free US Shipping Over $25
    Added: 01-Oct-10
  17. Agena Flexible Slow Motion Cable with Rosette Handle - 9.5"
    Agena Flexible Slow Motion Cable with Rosette Handle - 9.5"
    Our Price: $10.75
    In Stock
    Free US Shipping Over $25
    Added: 21-May-10
  18. ZWO Anti-dew Heater Strip
    ZWO Anti-dew Heater Strip
    Our Price: $19.00
    In Stock
    Free US Shipping Over $25
    Added: 09-Dec-17
  19. ZWO Filter Drawer with M42 & M48 Threads (Gen 2) - For 2" Mounted Filters # FD-M42-II
    ZWO Filter Drawer with M42 & M48 Threads (Gen 2) - For 2" Mounted Filters # FD-M42-II
    Our Price: $79.00
    In Stock
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    Added: 18-Jan-23
  20. Farpoint Bahtinov Focus Mask for Telescopes with Dew Shield or Front End Diameter from 3.5" to 6.5" # FP401
    Farpoint Bahtinov Focus Mask for Telescopes with Dew Shield or Front End Diameter from 3.5" ...
    Our Price: $24.50
    Out of Stock
    Free US Shipping Over $25
    Added: 13-Jul-10
  21. Agena Rubber O-Ring for 50mm Finders # ORING46
    Agena Rubber O-Ring for 50mm Finders # ORING46
    Our Price: $1.50 As low as $1.30
    Out of Stock
    Free US Shipping Over $25
    Added: 14-Apr-11
  22. Agena End Cap: ID = 2.00" (50.8mm), Rubber, Black
    Agena End Cap: ID = 2.00" (50.8mm), Rubber, Black
    Our Price: $4.25
    Out of Stock
    Free US Shipping Over $25
    Added: 02-Oct-10
  23. On Sale
    QHY PoleMaster Electronic Polar Alignment Scope
    QHY PoleMaster Electronic Polar Alignment Scope
    Sale Price: $215.20 Our Price: $269.00
    In Stock
    Free US Shipping
    Added: 19-Sep-18
  24. William Optics 2" 99% Dielectric Dura Bright Carbon Fiber Mirror Diagonal for Refractors
    William Optics 2" 99% Dielectric Dura Bright Carbon Fiber Mirror Diagonal for Refractors
    Our Price: $158.00
    In Stock
    Free US Shipping
    Added: 21-May-10
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  1. best-seller 1 item
  2. clearance 146 items
  3. closeout 42 items
  4. coming-soon 73 items
  5. discontinued 58 items
  6. new 2361 items
  7. none 1 item
  8. sale 39 items
  9. special 12 items
Adapter Specifications
  1. 0.965" Eyepiece Holder 2 items
  2. 0.965" Nosepiece 1 item
  3. 1.25" Eyepiece Holder 44 items
  4. 1.25" Nosepiece 19 items
  5. 2" Eyepiece Holder 50 items
  6. 2" Nosepiece 72 items
  7. M28.5 (1.25" Filter) Thread - Male 11 items
  8. M28.5 (1.25" Filter) Thread - Female 32 items
  9. M48 (2" Filter) Thread - Male 84 items
  10. M48 (2" Filter) Thread - Female 166 items
  11. T / T2 Filter Thread - Male 142 items
  12. T / T2 Filter Thread - Female 117 items
  13. SCT Thread - Male 37 items
  14. SCT Thread - Female 85 items
  15. C / CS Thread - Male 19 items
  16. C / CS Thread - Female 10 items
  17. M12 Webcam Thread - Male 3 items
  18. Meade ETX Thread - Female 1 item
  19. Miscellaneous Thread - Male 298 items
  20. Miscellaneous Thread - Female 176 items
  21. M42 (1.25" Filter) Thread - Female 6 items
Dovetail Design/Series
  1. Other 15 items
  2. V Series (Vixen) 73 items
  3. D Series (Losmandy) 45 items
  4. DV Series 29 items
  5. Arca-Swiss 14 items
Accessory Size
  1. 1.25 inch 298 items
  2. 2 inch 335 items
  3. 31mm Round Unmounted 90 items
  4. 36mm Round Unmounted 138 items
  5. 47.4mm Round Unmounted 11 items
  6. 50.4mm Round Unmounted 53 items
  7. 50mm Round Unmounted 30 items
  8. 77mm Round Mounted 4 items
  9. 82mm Round Mounted 3 items
  10. 50mm Square Unmounted 28 items
  11. DSLR Clip On - Canon EOS APS-C 6 items
  12. DSLR Clip On - Canon EOS FF 5 items
  13. DSLR Clip On - Sony 1 item
  14. T / T2 Threaded 5 items
  15. Hybrid 8 items
  16. SCT 2 items
Screw Type
  1. Machine screw 1 item
  2. Thumb screw 47 items
Screw Heads
  1. Button 1 item
  2. Knob 8 items
  3. Knurled 39 items
Material
  1. Plastic / Nylon 40 items
  2. Stainless Steel 1 item
  3. Zinc Plated Steel 8 items
Color
Eyepiece Field of View
  1. Up to 50 degrees 76 items
  2. 51 - 60 degrees 105 items
  3. 61 - 70 degrees 86 items
  4. 71 - 80 degrees 31 items
  5. Over 80 degrees 50 items
Focuser Scope Type
  1. Reflector 13 items
  2. Refractor 11 items
  3. SCT 8 items
Telescope Mount Type
  1. No Mount (OTA Only) 192 items
  2. Alt-Azimuth (AZ) 31 items
  3. Equatorial (EQ) 47 items
  4. Fork (Dual Arm) 27 items
  5. Fork (Single Arm) 13 items
  6. Dobsonian 21 items
Binocular Prism Type
  1. Porro Prism 19 items
  2. Roof Prism 29 items
Manufacturer
  1. 3D Astro Accessories 125 items
  2. 3D Astronomy 5 items
  3. 3DiBari 1 item
  4. 4026 Astronomy 4 items
  5. Agena Astro 333 items
  6. Agena Hobby Supply 51 items
  7. All Other 7 items
  8. American Paper Optics 4 items
  9. Antares 43 items
  10. Antlia Filters 97 items
  11. Artesky 3 items
  12. Askar 72 items
  13. Astrodevice 15 items
  14. Astrodymium 20 items
  15. Astronetics Design 2 items
  16. AstroPixels Publishing 1 item
  17. Astrozap 1 item
  18. Baader Planetarium 706 items
  19. Beamfist 1 item
  20. Berlebach 81 items
  21. Blue Fireball 265 items
  22. Bob's Knobs 68 items
  23. Brandon / Vernonscope 38 items
  24. BST 20 items
  25. BuckeyeStargazer 140 items
  26. Celestial Teapot Designs 1 item
  27. Celestron 415 items
  28. Chroma Technologies 133 items
  29. Coronado 18 items
  30. David Chandler Company 6 items
  31. DayStar Filters 29 items
  32. Dew-Ninja 2 items
  33. Dew-Not 20 items
  34. DGM Optics 8 items
  35. Explore Scientific 90 items
  36. Farpoint Astronomical 54 items
  37. Founder Optics 31 items
  38. GSO 211 items
  39. HoTech 21 items
  40. Howie Glatter 16 items
  41. Hubble Optics 1 item
  42. IDAS Filters 9 items
  43. iOptron 192 items
  44. Kasai Trading Co. 5 items
  45. Kokusai Kohki 13 items
  46. Levenhuk 2 items
  47. Long Perng 36 items
  48. Lumicon 59 items
  49. Lunt Solar Systems 35 items
  50. Machinza Astro Products 1 item
  51. Masuyama 5 items
  52. Meade 123 items
  53. Nikon 8 items
  54. OCAL 2 items
  55. Optolong 86 items
  56. Pegasus Astro 146 items
  57. Pentax 15 items
  58. Player One Astronomy 2 items
  59. PrimaLuceLab 184 items
  60. ProAstroGear 3 items
  61. QHYCCD 124 items
  62. Radian 1 item
  63. Revolution Imager 18 items
  64. Rigel Systems 16 items
  65. ROR 2 items
  66. Sharpstar 20 items
  67. Sky Watcher 96 items
  68. Spectrum Telescope 91 items
  69. Starlight Instruments 68 items
  70. STC 2 items
  71. Takahashi 80 items
  72. Tele Vue 164 items
  73. Telrad 18 items
  74. Thousand Oaks Optical 51 items
  75. Track the Stars (TTS) 17 items
  76. Unihedron 17 items
  77. Universal Astro 7 items
  78. Vaonis 12 items
  79. Vixen Optics 32 items
  80. William Optics 171 items
  81. ZWO Astronomy Cameras 224 items
Binocular Series
  1. Celestron Cometron 1 item
  2. Celestron Echelon 1 item
  3. Celestron EclipSMART 3 items
  4. Celestron Nature DX 7 items
  5. Celestron Nature DX ED 4 items
  6. Celestron Oceana 1 item
  7. Celestron Outland X 5 items
  8. Celestron SkyMaster 11 items
  9. Celestron TrailSeeker 4 items
  10. Celestron UpClose 9 items
  11. Exp Scientific BT 4 items
  12. Founder Optics MB 1 item
  13. Meade Astro 1 item
Telescope Series
  1. Askar ACL 1 item
  2. Askar APO 4 items
  3. Askar F 1 item
  4. Askar FRA 4 items
  5. Askar FMA 3 items
  6. Askar PHQ 5 items
  7. Askar V 1 item
  8. Celestron Advanced VX 13 items
  9. Celestron Astro Fi 3 items
  10. Celestron AstroMaster 9 items
  11. Celestron CGE 14 items
  12. Celestron CGEM HD 6 items
  13. Celestron CGEM II 6 items
  14. Celestron CGEM II HD 3 items
  15. Celestron CGX 8 items
  16. Celestron CGX-L 6 items
  17. Celestron CPC 6 items
  18. Celestron Inspire 2 items
  19. Celestron LCM 1 item
  20. Celestron NexStar Evolution 4 items
  21. Celestron NexStar SE 4 items
  22. Celestron NexStar SLT 4 items
  23. Celestron Omni XLT 3 items
  24. Celestron Origin 1 item
  25. Celestron PowerSeeker 7 items
  26. Celestron RASA 9 items
  27. Celestron SkyProdigy 1 item
  28. Celestron Spotting Scopes 17 items
  29. Celestron StarSense Explorer 10 items
  30. Celestron Travel Scope 3 items
  31. Coronado PST 2 items
  32. Coronado SolarMax III 8 items
  33. DayStar 2 items
  34. Explore Scientific FCD100 1 item
  35. Founder Optics FOT Apo 2 items
  36. Founder Optics Bino One Spotting Scope 2 items
  37. Founder Optics Draco Refractor 1 item
  38. GSO Cassegrain 5 items
  39. GSO Standard Newtonian 6 items
  40. GSO Imaging Newtonian 7 items
  41. GSO Ritchey-Chrétien 10 items
  42. Lunt MT 12 items
  43. Lunt Solar Ha 2 items
  44. Meade ACF f/8 OTA 4 items
  45. Meade LX85 10 items
  46. Meade LX90 3 items
  47. Meade LX200-ACF 15 items
  48. Meade LX600-ACF 8 items
  49. Meade LX850-ACF 3 items
  50. Meade Spotting Scopes 1 item
  51. Sharpstar Newtonian Astrographs 3 items
  52. Sharpstar Refractors 7 items
  53. Sky Watcher Flextube Dobsonian 3 items
  54. Sky Watcher Esprit APO 4 items
  55. Sky Watcher EvoStar 3 items
  56. Sky Watcher Flextube SynScan Dobsonian 5 items
  57. Sky Watcher Heritage 2 items
  58. Sky Watcher Maksutov 5 items
  59. Sky Watcher ProEd 3 items
  60. Sky Watcher Quattro 4 items
  61. Sky Watcher Skymax 3 items
  62. Sky Watcher StarTravel 4 items
  63. Sky Watcher Traditional Dobsonian 3 items
  64. Sky Watcher Virtuoso Dobsonian 2 items
  65. Takahashi Epsilon 3 items
  66. Takahashi FC 4 items
  67. Takahashi FOA 1 item
  68. Takahashi FS 2 items
  69. Takahashi FSQ 2 items
  70. Takahashi Mewlon 2 items
  71. Takahashi TS 2 items
  72. Takahashi Starbase 1 item
  73. Universal Astro Spotting Scopes 1 item
  74. Vaonis Hestia 2 items
  75. Vaonis Vespera 1 item
  76. William Optics FLT 10 items
  77. William Optics GT 9 items
  78. William Optics GuideStar 5 items
  79. William Optics RedCat 8 items
  80. William Optics Pleiades 2 items
  81. William Optics Zenith Star 6 items
  82. ZWO Refractors 4 items
  83. ZWO Seestar 1 item
Telescope Aperture
  1. Up to 2" [51mm] 19 items
  2. 2.1 - 3" [76mm] 24 items
  3. 2.1 - 3" [76mm] 31 items
  4. 3.1 - 4" [102mm] 74 items
  5. 4.1 - 5" [127mm] 33 items
  6. 5.1 - 6" [153mm] 53 items
  7. 6.1 - 8" [203mm] 49 items
  8. 8.1 - 10" [254mm] 35 items
  9. 10.1 - 12" [305mm] 31 items
  10. 12.1 - 16" [407mm] 21 items
Telescope Optical Design
  1. Solar 19 items
  2. Advanced Coma Free (ACF) 37 items
  3. Aplanatic Schmidt (EdgeHD) 19 items
  4. Astrograph 13 items
  5. Maksutov-Cassegrain 13 items
  6. Maksutov-Newtonian 1 item
  7. Schmidt-Cassegrain 27 items
  8. Cassegrain Reflector 7 items
  9. Newtonian Reflector 56 items
  10. Ritchey-Chretien 10 items
  11. Doublet (Achromat) 26 items
  12. Doublet (Apochromat) 21 items
  13. Triplet (Apochromat) 31 items
  14. Petzval 21 items
  15. Other 4 items
Telescope Focal Length
  1. Up to 300mm 16 items
  2. 301 - 400mm 28 items
  3. 401 - 500mm 27 items
  4. 501 - 600mm 30 items
  5. 601 - 700mm 24 items
  6. 701 - 800mm 22 items
  7. 801 - 900mm 14 items
  8. 901 - 1000mm 27 items
  9. 1001 - 1250mm 19 items
  10. 1251 - 1500mm 16 items
  11. 1501 - 1750mm 6 items
  12. 1751 - 2000mm 8 items
  13. 2001 - 2500mm 49 items
  14. 2501 - 3000m 19 items
  15. Greater than 3000mm 17 items
Telescope Focal Ratio
  1. Up to f/4 34 items
  2. f/4.1 - f/5 52 items
  3. f/5.1 - f/6 41 items
  4. f/6.1 - f/7 44 items
  5. f/7.1 - f/8 43 items
  6. f/8.1 - f/9 6 items
  7. f/9.1 - f/10 71 items
  8. f/10.1 - f/11 7 items
  9. f/11.1 - f/12 17 items
  10. f/12.1 - f/13 6 items
  11. Greater than f/13 6 items
Eyepiece Focal Length
  1. 5mm and Under 43 items
  2. 5.1mm - 10mm 84 items
  3. 10.1mm - 15mm 64 items
  4. 15.1mm - 20mm 65 items
  5. 20.1mm - 30mm 53 items
  6. 30.1mm - 40mm 35 items
  7. 40.1mm and Higher 13 items
  8. Variable Range 10 items
Experience Level
  1. Beginner 59 items
  2. Intermediate 143 items
  3. Advanced 72 items
Dovetail Length
  1. Up to 4" 5 items
  2. 4.1" - 6" 21 items
  3. 6.1" - 8" 18 items
  4. 8.1" - 10" 37 items
  5. 10.1" - 12" 7 items
  6. 12.1 - 14" 12 items
  7. Greater than 14" 32 items
Stock
  1. In Stock 3888 items
  2. Out of Stock 1432 items
Price
  1. $0.00 - $10,000.00 5305 items
  2. $10,000.00 - $20,000.00 13 items
  3. $20,000.00 - $30,000.00 1 item
  4. $50,000.00 - $60,000.00 1 item
$ - $